Nut-lock.



' G R Y A N.

OOOOOO K.

APPLICATION FILED s 1111111111 2.

CATHERINE RYAN, OF ST. PAUL, MINNESOTA.

NUT-LOOK.

To all whom it may concern:

Be it. known that I, CATHERINE RYAN, a citizen of the United States, residin at St. Paul, in the county of Ramsey and tate of Minnesota, have invented certain new and useful Improvements in Nut-Locks, of which the following is a specification.

My invention relates to nut locks, and has in-view particularly to provide such a device in which the essential locking element consists in a peculiar formation of the threads of the bolt such that a nut of any formation whatever having at least a portion of its threads formed to cooperate with such bolt formation to cause the nut to turn with difiiculty over the same thereafter turning more easily toward the unthreaded portion of the bolt.

In the drawings, Figures 1 and 2 illus trate two bolts each employing a thread structure involving my invention. Fig. 3 is a plan view of a nut havin threads thereof adapted to cooperate with the bolt to efiect the aforesaid locking action. The forms of bolts shown in Figs. 1 and 2 are substantially the same as far asthe principle of my invention is concerned. In Fig. 1 a series of teeth a continuously increase in depth to the unthreaded portion 7) of the bolt, said threads a!v extending from'threads intermediate the end of the unthreaded portion Which are the shallowest threads of the bolt, a, short series of threads (l gradually increasing in depth from the threads 0 to the outer end of the bolt. to permit ready introduction of the nut upon the bolt. In the form of bolt shown in Fig. 2 the threads at extend from the end of the bolt to the unthreaded portion constantly increasing in depth throughout the extent of the threaded portion of the bolt.

Various forms of nuts may be employed in connection with bolts involving my invention, it only being necessary that some of the threads of the nut shall be so formed as to sink in to the shallowest portion of the bolt. Such a nut may have its interior normally straight walled and cylindrical or tapering from one side of the nut to the other. In either of these cases the threads may be normal threads, or may be threads having one side more oblique than the other.

Patented June 17,191 3.

The threads may be cut oif at the tops so as to have flat tops either entirely across the threaded port-ion of the nut or across a portionof the threaded portion of the nut, or the threads may have pointed tops' or blunt tops part or all of the way through the interior of the nut, or the nut may have threads progressively increasing in depth from one side of the nut to the other or only part way through the nut, and the interior of the nut may be cylindrical for a part of the distance and tapering the balance of the-distance, if desired. In cases where the outer limits of the most exposed threads of the nut aresuch as to have a diameter considerably less than the inner limits of the shallowest threads of the bolt, the nut may, if desired, be provided with three more or less clefts inthe interior thereofto permit slight expansion.

\Vhatever the type of nut employedthe principle of operation is identically the same, namely, a certain thread or threads of the nut in relation to the shallowest threads of the bolt are such as to sink in to the ma- I terial of the bolt to some extent as said threads are driven over the bank of shal lowest threads in the bolt; and after such nut threads have passed the said bank the nut Will tend to turn more easily toward theunthreaded portion of'the bolt and therenot thereby be expanded permanently, and

will cling to and grip the threads beyond the shallow threads, having the effect of constantly tending to turn in toward the unthreaded portion of the bolt, so that the shallow threads have the effect of absolutely locking the nut upon the bolt.

I claim:

A bolt having a series of threads growing progressively deeper toward the unthreaded portion of the bolt, in combination with a closedv nut having a thread or threads so formed in relation to the shalbank of shallowest threads acting as a lock lowest threads of the bolt that said nut to hold the nutu on the bolt. 10 thread or threads will sink into and clasp In testimony w ereof I atfix my signature the material of the bolt as the same is turned in presence of two witnesses.

over the bank formed by the shallow CATHERINE RYAN.

threads, and nut tending to turn toward the Witnesses: unthreaded portion of the bolt after passing 1*. A. WHITELEY, said bank of shallowest threads and said H. A. BOWMAN. 

